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Full text of "The Cambridge Natural History"

VERTEBRAE   AND   RIBS

varies; two to four may be thus united. The additional
articular facets upon the dorsal vertebrae have been already
commented upon as a point of important likeness to other
American Edentates. The dorsal vertebrae are commonly eleven
in number, the lumbar being three. But in Priodon, the numbers
are twelve and two respectively. There are traces to be observed
of the double-headed attachment of the ribs to the sternum. The

Fia 100.—Bones of the right
inanus of the Hairy Armadillo.
Dct$y$nts vtilosus. x -§. c,
Cuneiform ; 2, lunar ; wi, mag-
num.; jj, pisiform ; ./£, radius ;
s, scaplioid ; til, trapezoid ; tmr
trapezium ; uf uncfform ; U,
ulna ; I- V, digits. (From
Flower's Osteology.)

FIG. 101.—Bones of tlie maims of
the Great Armadillo. P notion
gif/anteits. x £. a, An acces-
sory carpal ossicle in front of
the pisiform, which is not seen
in the figure. Other letters as
in Fig. 100. (From Flower's
Osteology.)

shoulder girdle of the Armadillos is somewhat diverse in form in
different genera; the aeromioii is always large, and is remark-
able in JPriodon for the fact that the humerus also articulates
with it, its extremity being recurved, and forming a socket for
this purpose. As in some other Edentates there is a second
spine 011 the scapula behind the first. The clavicle is strong.
There is some variation in the form of the maims. It is iive-
tingered in Dafiypttsi in Toly-peutes the first digit has vanished;
ou the other hand, iu Privdon> the fiffcli has become